Door-frame and door structure for furnaces.



L. L. KNOX.

DOOR FRAME AND DOOR STRUCTURE FOR FURNACES APPLICATION FILED DEC. 31. I917- 3;. 5%? Padmnted Aug 13,19M

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LUTHER I. KNOX, OF BELLEVUE, PENNSYLVANIA, ASSIGNOR TO BLAW-KNOX COM PANY, OF PITTSBURGH, PENNSYLVANIA, A COBJP ORATION OF NEW JERSEY.

DOOR-FRAME AND DOOR STRUCTURE FOR FURNACES.

Specification of Letters Patent.

Patented Au it 13, 19in.

Application filed December 31, 1917. Serial No. 209,635.

'panying drawings, forming part of this specification, in which: Figure l is a front elevation of a 'door frame and door structure embodying my invention. a

Fig. 2 is a top plan view of the same, and Figs. 3 and i are sections taken respectively on the lines'HI-III and IV-IV of Fig. 1.

My invention has relation to door frame and door structures for furnaces; and is designed to provide a. structure of this character having water cooled parts which can be readily formed from sheet metal by bending and welding processes. A further object of the invention is to provide structures of this character in which the door frame and door have co-acting guiding portions of novel and effective character.

The nature of my invention will be best understood by reference to the accompan ing drawings in which I have shown a preferred embodiment thereof, and which will now be described, it being premised, however, that various changes can be made in the details of construction and arrangement of the various parts, without depart ing from the spirit and scope of my invention, as defined in the appended cl aims In these drawings, the nume'al 2 designates a portion of the wall of a furnace having therein the usual door opening 8. i: designates a rigid metallic f 'ame surrounding the door opening, and which may be, in gen eral, of any suitable character. 5 is a liollow water-cooled top or lintel member sup ported at the upper edge or the door opening between the posts of the frame 4, being secured to, said posts by the forwardly projecting extensions 6 of its end plates. This member can be conveniently formed from a sheet metal plate bent upon itself to give it the required hollow cross section,

with its free end portions welded together at any suitable point. .lts outer face 7 forms a vertical door seating and guid ng surface,

while its inner wall 8 is sloped downwardly andinwardly to form a skew-back for supporting the furnace, arch 9. The end portions of said member 5 are reduced, as shown at 10, to form guideways for the edges of the door, hereinafter described. 11 designates hollow vertical frame members which extend upwardly, one at each side of the door opening 3. Each of these members may be conveniently formed of a sheet metal plate bent uponitself to give a gen erally rectangular hollow section with the offset 12 at the inner corner of its outer or front wall. One edge portion of the metal is bent forwardly to form a bolting flange 13, which is bolted to the web of the vertical frame member l. The recesses let (see Fig. 3) formed by the forward offsets 12' correspond with the recesses 10 formed by the reduced end portions of the member 5.

.15 designates the door which is also of hollow sheet metal form shaped on its inner side to form a pocket or recess forthe re ception ofthe refractory lining 1G. The door may be conveniently built up from sheet metal plates, flanged to form, the edge forming flanges 17 of the outer plate being extended beyond the seating flanges 18 of the inner plate and into the recesses 10 and 14-, before described, to act guides. The bottom plate of the door is preferably inclined upwardly and inwardly, as shown at 19, so that when the door is seatedin vertical position upon the sillQO, the seating will occur at a point near the outer edge of the door and outside. of its center of gravity. This tends to hold the door in its closed position and to prevent it from tipping away from its seating surfaces on the frame.

'21., wherever seen. designates inlet connections for supplying water to the hollow water cooled members, and Q2 designates outlet connections for the heated water. These connections may be of any suitable character. illy invention prmidcs a frame and door structure for furnaces in which the parts subject to the greatest heat and greatest Wear may be effectively water cooled; in

which the water cooled parts can be readily W hollow Water cooled of which is formed With a guiding ofi'set at the inner corner of its outer side, of a door having its end Walls extended inwardly in the edgewise plane of said Walls-and beyond its seating faces, said extensions co-acting with said oflsets to form guiding means for the door, the door and door frame having abutting seating portions adjacent to the end-wall guiding extensions; substantially as described. I

2. The combination with a door frame having Vertical water cooled members, each of which is formed with a guiding ofiset at the inner corner of its outer side, of a hol low water cooled door having its end walls extended inwardly beyond its seating'faces, said extensions co-acting with said offsets to form guiding means for the door, the frame also having a top member formed with reduced end portions lying above the guiding recesses formed by the offsets in said vertical members; substantially as de-',

scribed.

3. The combination with a door frame having vertical hollow Water cooled members formed each with a hollow tion at the inner corner of'its outer face, one face of the offset forming a door seating surface, and the other facea door guiding surface,of a door having co-acting seating surfaces and co-acting rearwardly projecting guiding flanges, the door-seatin surfaces hung inside of and independent 0 the said guiding flanges; substantially as described.

4:. In a door frame structure for furnaces, a hollow Water cooled member whose body portion is. formed from a metal plate bent upon itself to rectangular hollow section with an angular hollow ofiset at the inner corner of its outer side, one edge portion of said sheet or' strip being extendedoutwardly to form a vertical attaching flange; substantially as described.

In testimony whereof I have hereunto set my hand.

form a generally LUTHER L. KNOX.

oifset' por- I sheet or 

